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Engineering Worksheet: Mechanical Advantage and Work

Engineering lesson 15: Mechanical advantage and work · Set 510 · 40 questions
TalentJR

Engineer's tip (Less force, more distance): MA = load ÷ effort. Work (J) = force (N) × distance (m); force = work ÷ distance; distance = work ÷ force. Ideal ramp: MA = length ÷ height, effort = load ÷ MA.

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  1. 1.🏋️ Work is done when a force moves something … (a) very slowly (b) without moving it (c) through a distance (d) only upwards
  2. 2.🏋️ A 6 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  3. 3.🏋️ A machine lifts a load of 60 N when you push with 20 N. What is its mechanical advantage (MA)?
  4. 4.🏋️ Pushing a crate 5 m took 250 J of work. What force was used, in newtons?
  5. 5.🏋️ A force of 340 N did 1020 J of work. How many metres did the object move?
  6. 6.🏋️ A 9 kg box is lifted straight up by 1 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  7. 7.🏋️ Pushing a crate 7 m took 350 J of work. What force was used, in newtons?
  8. 8.🏋️ A force of 90 N pushes a cart 7 m along the floor. How much work is done, in joules?
  9. 9.🏋️ A 14 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  10. 10.🏋️ Pushing a crate 1 m took 180 J of work. What force was used, in newtons?
  11. 11.🏋️ Mechanical advantage (MA) = … (a) effort ÷ load (b) load + effort (c) load × effort (d) load ÷ effort
  12. 12.🏋️ A force of 430 N did 3010 J of work. How many metres did the object move?
  13. 13.🏋️ Pushing a crate 2 m took 240 J of work. What force was used, in newtons?
  14. 14.🏋️ A force of 440 N pushes a cart 8 m along the floor. How much work is done, in joules?
  15. 15.🏋️ A smooth ramp is 12 m long and rises 3 m. What effort pushes a 4000 N box up it, in newtons? (ideal ramp, no friction)
  16. 16.🏋️ A smooth ramp is 12 m long and rises 2 m. What effort pushes a 4500 N box up it, in newtons? (ideal ramp, no friction)
  17. 17.🏋️ A force of 360 N did 3600 J of work. How many metres did the object move?
  18. 18.🏋️ Pushing a crate 1 m took 80 J of work. What force was used, in newtons?
  19. 19.🏋️ A force of 370 N did 1110 J of work. How many metres did the object move?
  20. 20.🏋️ Can a simple machine reduce the work done? (a) only on Mondays (b) yes, always (c) no, work stays the same (d) yes, by half
  21. 21.🏋️ A force of 10 N did 10 J of work. How many metres did the object move?
  22. 22.🏋️ A 4 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  23. 23.🏋️ A 10 kg box is lifted straight up by 3 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  24. 24.🏋️ A longer ramp to the same height needs … (a) more effort (b) less effort (c) no effort (d) the same effort
  25. 25.🏋️ A machine lifts a load of 120 N when you push with 60 N. What is its mechanical advantage (MA)?
  26. 26.🏋️ A 5 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  27. 27.🏋️ A force of 200 N pushes a cart 10 m along the floor. How much work is done, in joules?
  28. 28.🏋️ Pushing a crate 3 m took 1230 J of work. What force was used, in newtons?
  29. 29.🏋️ A 2 kg box is lifted straight up by 2 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  30. 30.🏋️ Pushing a crate 8 m took 2160 J of work. What force was used, in newtons?
  31. 31.🏋️ A force of 340 N pushes a cart 5 m along the floor. How much work is done, in joules?
  32. 32.🏋️ A machine lifts a load of 200 N when you push with 100 N. What is its mechanical advantage (MA)?
  33. 33.🏋️ Pushing a crate 5 m took 1550 J of work. What force was used, in newtons?
  34. 34.🏋️ Pushing a crate 4 m took 80 J of work. What force was used, in newtons?
  35. 35.🏋️ A force of 420 N pushes a cart 1 m along the floor. How much work is done, in joules?
  36. 36.🏋️ A force of 220 N did 1320 J of work. How many metres did the object move?
  37. 37.🏋️ A smooth ramp is 4 m long and rises 2 m. What effort pushes a 1700 N box up it, in newtons? (ideal ramp, no friction)
  38. 38.🏋️ Pushing a crate 5 m took 400 J of work. What force was used, in newtons?
  39. 39.🏋️ A 9 kg box is lifted straight up by 5 m. Taking 1 kg to weigh about 10 N, how much work is done, in joules?
  40. 40.🏋️ A force of 320 N pushes a cart 10 m along the floor. How much work is done, in joules?

Answer key

  1. through a distance
  2. 300
  3. 3
  4. 50
  5. 3
  6. 90
  7. 50
  8. 630
  9. 700
  10. 180
  11. load ÷ effort
  12. 7
  13. 120
  14. 3520
  15. 1000
  16. 750
  17. 10
  18. 80
  19. 3
  20. no, work stays the same
  21. 1
  22. 200
  23. 300
  24. less effort
  25. 2
  26. 250
  27. 2000
  28. 410
  29. 40
  30. 270
  31. 1700
  32. 2
  33. 310
  34. 20
  35. 420
  36. 6
  37. 850
  38. 80
  39. 450
  40. 3200

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